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LAURENCE LEE GREENHILL M.D.
NPI 1992823546
Psychiatry & Neurology - Child & Adolescent Psychiatry in Mamaroneck, NY

Active since March 26, 2007PECOS EnrolledAccepts Medicare Assignment
9 COUNTRY RD, MAMARONECK, NY 10543(914) 381-2436(914) 381-2436 Get Directions Write a Review

NPPES record last updated: February 11, 2022. Verified against the NPPES registry weekly; last sync: October 18, 2026.

About Laurence Lee Greenhill M.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

LAURENCE LEE GREENHILL M.D. (NPI 1992823546) is an individual child & adolescent psychiatry provider in Mamaroneck, New York, licensed in New York (102893) and active in the NPI registry since March 2007. He is enrolled in Medicare PECOS and is a graduate of Albert Einstein College Of Medicine Of Yeshiva University (1967).

NPPES Registry Identity

NPI1992823546
Entity TypeIndividualMale
Primary Taxonomy2084P0804X
Provider Legal NameLAURENCE LEE GREENHILLCredential: M.D.
Location Address9 COUNTRY RDMamaroneck, NY 10543-1105
Mailing Address9 Country RdMamaroneck, NY 10543-1105 · (914) 381-2436 · Fax (914) 381-2436
Phone(914) 381-2436
Fax(914) 381-2436
Sole ProprietorYes
Medical School CMSAlbert Einstein College Of Medicine Of Yeshiva UniversityGraduated 1967
Enumeration DateMarch 26, 2007
Last NPPES UpdateFebruary 11, 2022
✔ NPI 1992823546 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPsychiatry & Neurology · Child & Adolescent PsychiatryAllopathic & Osteopathic Physicians
Taxonomy Code2084P0804X
License✔ Licensed in NY · 102893
Definition
Child & Adolescent Psychiatry is a subspecialty of psychiatry with additional skills and training in the diagnosis and treatment of developmental, behavioral, emotional, and mental disorders of childhood and adolescence.
9 COUNTRY RD, Mamaroneck, NY 10543
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Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Laurence Lee Greenhill M.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID3779844048
PECOS Enrollment IDI20180301000382
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

3

Medicare enrollment records show Laurence Greenhill reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Permanente Medical Group Inc
2,519 mi
Internal Medicine
7373 WEST LANE
Stockton, CA 95210
  • Reassigned Medicare billing, California enrollment
  • 20,078 clinicians in this Medicare group
NPI 1548343510 (209) 476-2000
University Of California San Francisco
2,584 mi
Surgery
400 PARNASSUS AVE, MCB 300
San Francisco, CA 94143
  • Reassigned Medicare billing, California enrollment
  • 5,645 clinicians in this Medicare group
NPI 1346329380 (415) 353-2161
Ucsf Medical Group Business Services
2,584 mi
Internal Medicine
400 PARNASSUS AVE
San Francisco, CA 94122
  • Reassigned Medicare billing, California enrollment
  • 5,544 clinicians in this Medicare group
NPI 1477624104 (415) 353-2808

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Laurence Greenhill's NPI number?

The NPI number for Laurence Greenhill is 1992823546. It was assigned to this individual provider in the NPPES registry on March 26, 2007.

Where is Laurence Greenhill located?

Laurence Greenhill practices at 9 Country Rd, Mamaroneck, NY 10543. The listed phone number is (914) 381-2436.

What is Laurence Greenhill's specialty?

The primary specialty registered for this NPI is Psychiatry & Neurology, specializing in Child & Adolescent Psychiatry, with taxonomy code 2084P0804X.

Is Laurence Greenhill enrolled in Medicare?

Yes. Laurence Greenhill is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organizations bill Medicare for Laurence Greenhill's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Laurence Greenhill reassigns Medicare benefits to 3 organizations: Permanente Medical Group Inc (Stockton, CA), University Of California San Francisco (San Francisco, CA) and Ucsf Medical Group Business Services (San Francisco, CA). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Laurence Greenhill's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for Laurence Greenhill was last updated on February 11, 2022. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.